Clinical Focus ›› 2024, Vol. 39 ›› Issue (11): 989-992.doi: 10.3969/j.issn.1004-583X.2024.11.005

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Monitoring of blood concentrations of isoniazid and rifampicin in different dosage forms

Wang Lin1, Wan Rong1, Liu Sha1, Liu lei2, He Jing1, Tang Libin1, Li Mingwu1()   

  1. 1. Second Department of Tuberculosis,Kunming Third People's Hospital,Kunming 650041,China
    2. School of Public Health,Dali University,Dali 671003,China
  • Received:2024-04-15 Online:2024-11-20 Published:2024-12-04
  • Contact: Li Mingwu E-mail:ynkmlmw@sina.com

Abstract:

Objective To measure blood concentrations of isoniazid (INH) and rifampicin (RFP) in different dosage forms. Methods From July 20, 2022 to November 30, 2022, 123 patients with active tuberculosis hospitalized in the Second Department of Tuberculosis of Kunming Third People's Hospital were included. They were randomly divided into injection group ( n=64) and oral group ( n=59). Both groups were given ethambutol and pyrazinamide. Additionally, the injection group was given RFP injection and INH injection, and the oral group was given RFP capsules and INH tablets. On the 7th day of treatment, blood samples were collected 2 hours and 24 hours after treatment, and the blood concentrations of INH and RFP in the two groups were detected by high performance liquid chromatography.Results There were no significant differences in age, sex, body mass index, treatment history, tuberculosis culture and lesion between the two groups (P>0.05). After 2 hours of medication on the 7th day of treatment, blood concentration of RFP and the proportion of patients with a targeted blood concentration of RFP were significantly higher in the injection group than those of the oral group (P<0.05). The proportions of patients with blood concentration of RFP<8 mg/L and 8-24 mg/L in the injection group was significantly lower than that of the oral group, and the proportion of patients with blood concentration of RFP>24 mg/L was significantly higher than that of the oral group (P<0.05). Multivariate linear regression model analysis showed that age was the influencing factor of blood concentration of INH. The older the age, the lower the blood concentration of INH ( F=7.774, P=0.006).Conclusion The blood concentration of RFP injections is significantly higher than that of oral RFP capsules. For patients with severe or oral treatment of gastrointestinal reactions, RFP injections can be given priority to improve the clinical efficacy. INH is recommended to be given according to body weight, aiming to increase the blood concentration and strengthen the blood concentration monitoring.

Key words: tuberculosis, rifampicin, isoniazid, different dosage forms, blood concentration

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